Dr. Wittich is a passionate speleologist who spends more time on his research than on his fiancée Cornelia. As a result, she turns to the rich industrialist Roy, whom she eventually marries. But her heart actually belongs to the explorer and so she is drawn back to him.

This Nazi propaganda film follows the exploits of a German submarine as it prowls the North Atlantic.

Singing sailor Hannes, who now entertains the crowd at St. Pauli's Hippodrome after years at sea, promises his dying brother that he will take care of his ex-girlfriend Gisa. Taking Gisa to Hamburg to live with him, Hannes quickly falls in love with her, but soon has to face Gisa's affection for another man, Willem.

At the Olympic games in Berlin 1936 Inge Wagner falls in love with Luftwaffenleutnant (Airforce Lieutenant) Herbert Koch. They want to marry, but he receives orders to go to Spain - incognito, without permission for any contacts to his friends and relatives. Inge is still waiting for him. After the beginning of WW II, German radio starts broadcasting the "Wunschkonzert für die Wehrmacht" - a program made of wishes from the soldiers. He hears the song, he wanted to hear, and so does Inge. A friend of Inge, who hopes she is willing to marry him, comes to the same squadron where Koch flies. Koch and Inge arrange a date at a Hamburg restaurant, but he and Ilse's friend are shot down the day before. In the hospital Koch finds out, that he and his friend love the same girl. He thinks they are already engaged and is willing to give her up.